8/18/2019 cara Servis Manual RX10KY1 Si_05c
1/457
SystemInverter K Series Series
Si-05C
Service
Manual
8/18/2019 cara Servis Manual RX10KY1 Si_05c
2/457
Si-05C
Table of Contents i
,QYHUWHU . 6HULHV,QYHUWHU . 6HULHV,QYHUWHU . 6HULHV,QYHUWHU . 6HULHV6HULHV6HULHV6HULHV6HULHV
1. Introduction ............................................................................................ ix1.1 Safety Cautions....................................................................................... ix
1.2 PREFACE ............................................................................................. xiii
3DUW4 *HQHUDO ,QIRUPDWLRQ
,QYHUWHU . 6HULHV 11111111111111111111111111111111111111111111111111111111111111114
1. Series Introduction ..................................................................................21.1 NOMENCLATURE ...................................................................................2
1.2 Indoor/Outdoor Unit Combinations...........................................................42. Outline of System....................................................................................5
2.1 Easily Recognizable Features of the “K” Series.......................................5
2.2 Changes in K Series Functions / Parts.....................................................6
2.3 Compatibility of Old and New VRV System Inverter ................................9
3DUW5 )XQFWLRQV
,QYHUWHU . 6HULHV 1111111111111111111111111111111111111111111111111111111111111144
1. Functions...............................................................................................12
1.1 Outdoor Unit Refrigerant System Diagram.............................................121.2 Function of Thermistors and Pressure Sensors.....................................26
1.3 List of Safety Devices and Functinal Parts Setting Values.....................27
1.4 Safety for Restart ...................................................................................28
1.5 Equalized Oil Level Operation
(Equalized Oil Level between Twin Compressors).................................30
1.6 Oil Return Operation ..............................................................................31
1.7 Defrost....................................................................................................32
1.8 Heating Pump Down Residual Operation...............................................33
1.9 Step Down / Safety Control → Standby (Forced Thermostat OFF) →
Stop Due to Malfunction .........................................................................35
1.10 Control During Low Outdoor Air Temperature Cooling ..........................37
1.11 Low Noise Control..................................................................................39
1.12 Demand Control .....................................................................................40
1.13 Compressor Capacity Control ................................................................41
1.14 Te / Tc Setting........................................................................................43
1.15 Gas Depletion Alarm ..............................................................................44
1.16 Drain Pump Control................................................................................45
1.17 Oil Temperature Sensor (8 and 10 Hp only) ..........................................47
1.18 Louver Control for Preventing Ceiling Dirt ..............................................48
1.19 Thermostat Sensor in Remote Controller...............................................49
1.20 Freeze Prevention ..................................................................................51
8/18/2019 cara Servis Manual RX10KY1 Si_05c
3/457
Si-05C
ii Table of Contents
3DUW6 7HVW 2SHUDWLRQ
,QYHUWHU . 6HULHV 1111111111111111111111111111111111111111111111111111111111111186
1. Test Operation ......................................................................................541.1 When Power is Turned On .....................................................................54
1.2 Outdoor Unit PC Board Ass’y.................................................................551.3 Setting Modes ........................................................................................57
1.4 Sequential Start......................................................................................63
1.5 External Control Adaptor for Outdoor Unit .............................................64
1.6 Cool / Heat Mode Selection....................................................................67
1.7 Low Noise / Demand Operation .............................................................72
1.8 Wiring Check Operation .........................................................................74
1.9 Indoor Unit PCB Ass’y............................................................................75
1.10 Remote Controllers (Wired and Wireless)..............................................76
1.11 Control by Remote Controller
(Double Remote Controllers, Group, Remote) .......................................81
1.12 Indoor Field Setting ................................................................................831.13 Centralized Control Group No. Setting...................................................85
1.14 Setting of Master Remote Controller ......................................................87
1.15 Remote Controller Self-Diagnosis Function ...........................................89
1.16 Operation of the Remote Controller’s Inspection /
Test Operation Button ............................................................................92
1.17 Remote Controller Service Mode ...........................................................93
1.18 Model Change of Centralized Control Devices ......................................95
1.19 Central Remote Controller (DCS302A51 / DCS302B61) .......................98
1.20 Unified ON/OFF Controller (DCS301A51/ DCS301B61)......................105
1.21 Schedule Timer (DST301A51 / DST301B61).......................................108
1.22 Combining Different Types of Centralized Control Devices .................112
3DUW 7 7URXEOHVKRRWLQJ
,QYHUWHU . 6HULHV 11111111111111111111111111111111111111111111111111111111111144:
1. Operation Flowcharts..........................................................................1191.1 Indoor Unit Operation Flowchart ..........................................................119
1.2 Outdoor Unit Operation Flowchart........................................................124
2. Diagnosis by Malfunction Code...........................................................1282.1 Diagnosis by Malfunction Code............................................................128
2.2 Failure Diagnosis..................................................................................129
3. Troubleshooting ..................................................................................1303.1 Indoor Unit: Error of External Protection Device ..................................130
3.2 Indoor Unit: PC Board Defect...............................................................131
3.3 Indoor Unit: Malfunction of Drain Level Control System (33H).............132
3.4 Indoor Unit: Fan Motor (M1F) Lock, Overload......................................133
3.5 Indoor Unit: Malfunction of Swing Flap Motor (M1S)............................134
3.6 Indoor Unit: Malfunction of Moving Part of
Electronic Expansion Valve (Y1E)........................................................135
3.7 Indoor Unit: Drain Level above Limit ....................................................136
3.8 Indoor Unit: Malfunction of Capacity Determination Device.................1373.9 Indoor Unit: Malfunction of Thermistor (R2T) for Liquid Pipe...............138
3.10 Indoor Unit: Malfunction of Thermistor (R3T) for Gas Pipes ................139
3.11 Indoor Unit: Malfunction of Thermistor (R1T) for Air Inlet.....................140
8/18/2019 cara Servis Manual RX10KY1 Si_05c
4/457
Si-05C
Table of Contents iii
3.12 Indoor Unit: Malfunction of Thermostat Sensor in Remote Controller..141
3.13 Outdoor Unit: Actuation of Safety Device.............................................142
3.14 Outdoor Unit: PC Board Defect ............................................................143
3.15 Outdoor Unit: Actuation of High Pressure Switch.................................144
3.16 Outdoor Unit: Actuation of Low Pressure Switch .................................145
3.17 Outdoor Unit: Malfunction of Moving Part of
Electronic Expansion Valve (Y1E)........................................................146
3.18 Outdoor Unit: Abnormal Discharge Pipe Temperature.........................147
3.19 Outdoor Unit: Malfunction of Thermistor for Outdoor Air (R1T)............148
3.20 Outdoor Unit: Malfunction of Discharge Pipe Thermistor (R3T)...........149
3.21 Outdoor Unit: Malfunction of Thermistor (R4T) for Suction Pipe..........150
3.22 Outdoor Unit: Malfunction of Thermistor (R2T) for Heat Exchanger ....151
3.23 Outdoor Unit: Malfunction of Discharge Pipe Pressure Sensor ...........152
3.24 Outdoor Unit: Malfunction of Suction Pipe Pressure Sensor................153
3.25 Outdoor Unit: Malfunction of Oil Temperature Thermistor (R5T) .........154
3.26 Low Pressure Drop Due to Refrigerant Shortage or
Electronic Expansion Valve Failure......................................................1553.27 Negative Phase, Open Phase..............................................................156
3.28 Malfunction of Transmission Between Indoor Units .............................157
3.29 Malfunction of Transmission Between Remote Controller
and Indoor Unit.....................................................................................158
3.30 Malfunction of Transmission Between Outdoor Units ..........................159
3.31 Malfunction of Transmission Between Master and
Slave Remote Controllers ....................................................................160
3.32 Malfunction of Transmission Between Indoor and
Outdoor Units in the Same System......................................................161
3.33 Excessive Number of Indoor Units.......................................................162
3.34 Address Duplication of Central Remote Controller...............................1633.35 Refrigerant System not set, Incompatible Wiring/Piping ......................164
3.36 Malfunction of System, Refrigerant System Address Undefined..........165
4. Failure Diagnosis for Inverter System.................................................1664.1 Points of Diagnosis...............................................................................166
4.2 How to use the Monitor Switch on the Inverter PC Board ....................167
5. Troubleshooting (Inverter)...................................................................1685.1 Outdoor Unit: Malfunction of
Inverter Radiating Fin Temperature Rise .............................................168
5.2 Outdoor Unit: Inverter Instantaneous Over-Current .............................169
5.3 Outdoor Unit: Inverter Thermostat Sensor, Compressor Overload ......1705.4 Outdoor Unit: Inverter Stall Prevention, Compressor Lock ..................171
5.5 Outdor Unit: Malfunction of Transmission between Inverter and
Control PC Board .................................................................................172
5.6 Power Supply Insufficient or Instantaneous Failure .............................173
5.7 Outdoor Unit: Malfunction of Inverter Radiating Fin Temperature
Rise Sensor..........................................................................................174
5.8 Outdoor Unit: Inverter Over-Ripple Protection .....................................175
6. Troubleshooting (OP: Central Remote Controller) ..............................1766.1 Malfunction of Transmission between Central Remote Controller and
Indoor Unit............................................................................................176
6.2 PC Board Defect ..................................................................................177
6.3 Malfunction of Transmission between Optional Controllers
for Centralized Control .........................................................................178
8/18/2019 cara Servis Manual RX10KY1 Si_05c
5/457
Si-05C
iv Table of Contents
6.4 Improper Combination of Optional Controllers
for Centralized Control .........................................................................179
6.5 Address Duplication, Improper Setting.................................................180
7. Troubleshooting (OP: Schedule Timer)...............................................1817.1 Malfunction of Transmission between Central Remote Controller and
Indoor Unit............................................................................................181
7.2 PC Board Defect ..................................................................................182
7.3 Malfunction of Transmission between Optional Controllers
for Centralized Control .........................................................................183
7.4 Improper Combination of Optional Controllers
for Centralized Control .........................................................................184
7.5 Address Duplication, Improper Setting.................................................185
8. Troubleshooting (OP: Unified ON/OFF Controller) .............................1868.1 Operation Lamp Blinks.........................................................................186
8.2 Display “Under Host Computer Integrate Control” Blinks
(Repeats Single Blink)..........................................................................187
8.3 Display “Under Host Computer Integrate Control” Blinks(Repeats Double Blink) ........................................................................189
9. Appendix .............................................................................................1909.1 Precaution ............................................................................................190
9.2 Typical Wiring Mistakes........................................................................191
3DUW 8 *HQHUDO ,QIRUPDWLRQ
3/86 6HULHV111111111111111111111111111111111111111111111111111111111111111111114
8/18/2019 cara Servis Manual RX10KY1 Si_05c
6/457
8/18/2019 cara Servis Manual RX10KY1 Si_05c
7/457
Si-05C
vi Table of Contents
3.6 Outdoor Unit: Malfunction of Moving Part of
Electronic Expansion Valve (Y1E)........................................................316
3.7 Outdoor Unit: Abnormal Discharge Pipe Temperture...........................317
3.8 Outdoor Unit: Defect of Pressure Switch for High Pressure Control....318
3.9 Outdoor Unit: Defect of Pressure Switch for Low Pressure Control.....319
3.10 Outdoor Unit: Malfunction of Thermistor for Outdoor Air (R1T)............320
3.11 Outdoor Unit: Malfunction of Discharge Pipe Thermistor (R3T)...........321
3.12 Outdoor Unit: Malfunction of Thermistor (R4T) for Suction Pipe..........322
3.13 Outdoor Unit: Malfunction of Thermistor (R2T) for Heat Exchanger ....323
3.14 Outdoor Unit: Malfunction of Thermistor (R6T) for Header ..................324
3.15 Outdoor Unit: Malfunction of Discharge Pipe Pressure Sensor ...........325
3.16 Outdoor Unit: Malfunction of Suction Pipe Pressure Sensor................326
3.17 Outdoor Unit: Malfunction of Oil Temperature Thermistor (R5T) .........327
3.18 Low Pressure Drop Due to Refrigerant Shortage or
Electronic Expansion Valve Failure......................................................328
3.19 Negative Phase, Open Phase..............................................................329
3.20 Malfunction of Transmission Between Indoor Units .............................3303.21 Malfunction of Transmission Between Outdoor Units ..........................331
3.22 Excessive Number of Indoor Units.......................................................332
3.23 Refrigerant System not set, Incompatible Wiring/Piping ......................333
3.24 Malfunction of System, Refrigerant System Address Undefined..........334
4. Failure Diagnosis for Inverter System.................................................3354.1 Points of Diagnosis...............................................................................335
5. How to Use The Monitor Switch On The Inverter PC Board...............3365.1 How to Use The Monitor Switch On The Inverter PC Board ................336
5.2 Actuation of Fin Thermal ......................................................................337
5.3 Defect of Compressor Coil ...................................................................338
5.4 Compressor Overload ..........................................................................339
5.5 Defect of Compressor ..........................................................................340
5.6 Malfunction of Connection Between The Inverter Unit and
Outdoor Unit PC Board ........................................................................341
5.7 Power Supply Insufficient .....................................................................342
5.8 Open Phase .........................................................................................343
5.9 Defect of Radiator Fin Temperature Sensor ........................................344
3DUW < 6SHFLDO 6HUYLFH 0RGH
3/86 6HULHV
11111111111111111111111111111111111111111111111111111111111111111111678
1. Backup and Emergency Operation .....................................................3461.1 Backup and Emergency Operation ......................................................346
2. Pump Down Operation when Replacing The Compressor .................3502.1 Pump Down Operation when Replacing The Compressor...................350
8/18/2019 cara Servis Manual RX10KY1 Si_05c
8/457
Si-05C
Table of Contents vii
3DUW 43$SSHQGL[
,QYHUWHU . 6HULHV
3/86 6HULHV11111111111111111111111111111111111111111111111111111111111111111111686
1. Wiring Diagrams (Outdoor Unit)..........................................................3551.1 Inverter K Series (Product Produced Before July ‘99)..........................355
1.2 Inverter K Series (Product Produced After Aug. ‘99)............................365
1.3 PLUS Series Function Unit...................................................................370
1.4 PLUS Series.........................................................................................374
2. Wiring Diagrams (Indoor Unit).............................................................3782.1 Ceiling Mounted Cassette Type (Double-Flow)....................................378
2.2 Ceiling Mounted Cassette Type (Multi-Flow) .......................................380
2.3 Ceiling Mounted Cassette Corner Type ...............................................383
2.4 Ceiling Mounted Cassette Built-In Type...............................................384
2.5 Ceiling Mounted Duct Type..................................................................386
2.6 Ceiling Suspended Type ......................................................................3882.7 Wall Mounted Type ..............................................................................389
2.8 Floor Standing Type / Concealed Floor Standing Type .......................390
2.9 Ceiling Mounted Duct Type (Low Silhouette Type - Cooling Only) ......392
2.10 Ceiling Mounted Duct Type..................................................................395
3. Wiring Diagrams (Outdoor Unit) Model for China ...............................3963.1 Cooling Only/Heat Pump......................................................................396
4. Wiring Diagrams (Indoor Unit) Model for China ..................................3984.1 Ceiling Mounted Cassette (Double-Flow) Type....................................398
4.2 Ceiling Mouted Cassette (Multi-Flow) Type .........................................400
4.3 Ceiling Mounted Cassette Corner Type ...............................................401
4.4 Ceiling Mounted Built-In Type ..............................................................402
4.5 Ceiling Mounted Duct Type..................................................................404
4.6 Ceiling Suspended Type ......................................................................405
4.7 Wall Mounted Type ..............................................................................406
4.8 Floor Standing Type/Concealed Floor Standing Type .........................407
5. Characteristics ....................................................................................4085.1 Thermistor Resistance / Temperature Characteristics .........................408
5.2 Pressure Sensor Voltage Output /
Detected Pressure Characteristics.......................................................410
6. Method of Replacing The Inverter’s Power Transistors and
Diode Modules ....................................................................................4116.1 Method of Replacing The Inverter’s Power Transistors and
Diode Modules .....................................................................................411
7. Wiring Adaptor ....................................................................................4137.1 Wiring Adaptor for Electrical Appendices (KRP2A61·62).....................413
7.2 Wiring Adaptor for Group Electrical Appendices
(KRP4A51 / KRP4A52 / KRP4A53)......................................................418
7.3 Adaptor for Wiring (KRP1B61 / KRP1B2 / KRP1B3)............................421
7.4 Interface Adaptor for Skyair Series (DTA102A52) ...............................423
7.5 Wiring Adaptor for Other Air Conditioners (DTA103A51).....................425
7.6 External Control Adaptor for Outdoor Units(DTA104A61 · DTA104A62).................................................................428
7.7 Unification Adaptor for Computerized Control (DCS302A52) ..............431
8/18/2019 cara Servis Manual RX10KY1 Si_05c
9/457
8/18/2019 cara Servis Manual RX10KY1 Si_05c
10/457
Si-05C Introduction
ix
1. Introduction
1.1 Safety Cautions
Cautions and
Warnings
„ Be sure to read the following safety cautions before conducting repair work.
„ The caution items are classified into “ Warning” and “ Caution”. The “ Warning” items are
especially important since they can lead to death or serious injury if they are not followed closely. The“ Caution” items can also lead to serious accidents under some conditions if they are not followed.
Therefore, be sure to observe all the safety caution items described below.
„ About the pictograms
This symbol indicates an item for which caution must be exercised.
The pictogram shows the item to which attention must be paid.
This symbol indicates a prohibited action.
The prohibited item or action is shown inside or near the symbol.
This symbol indicates an action that must be taken, or an instruction.
The instruction is shown inside or near the symbol.
„ After the repair work is complete, be sure to conduct a test operation to ensure that the equipment
operates normally, and explain the cautions for operating the product to the customer
1.1.1 Caution in Repair.
Warning
Be sure to disconnect the power cable plug from the plug socket before disassemblingthe equipment for a repair.Working on the equipment that is connected to a power supply can cause an electricalshook.If it is necessary to supply power to the equipment to conduct the repair or inspecting thecircuits, do not touch any electrically charged sections of the equipment.
If the refrigerant gas discharges during the repair work, do not touch the dischargingrefrigerant gas.The refrigerant gas can cause frostbite.
When disconnecting the suction or discharge pipe of the compressor at the weldedsection, release the refrigerant gas completely at a well-ventilated place first.If there is a gas remaining inside the compressor, the refrigerant gas or refrigeratingmachine oil discharges when the pipe is disconnected, and it can cause injury.
If the refrigerant gas leaks during the repair work, ventilate the area. The refrigerant gascan generate toxic gases when it contacts flames.
The step-up capacitor supplies high-voltage electricity to the electrical components of theoutdoor unit.Be sure to discharge the capacitor completely before conducting repair work.A charged capacitor can cause an electrical shock.
Do not start or stop the air conditioner operation by plugging or unplugging the powercable plug.Plugging or unplugging the power cable plug to operate the equipment can cause anelectrical shock or fire.
8/18/2019 cara Servis Manual RX10KY1 Si_05c
11/457
Introduction Si-05C
x
1.1.2 Cautions Regarding Products after Repair
Caution
Do not repair the electrical components with wet hands.Working on the equipment with wet hands can cause an electrical shock.
Do not clean the air conditioner by splashing water.Washing the unit with water can cause an electrical shock.
Be sure to provide the grounding when repairing the equipment in a humid or wet place,to avoid electrical shocks.
Be sure to turn off the power switch and unplug the power cable when cleaning theequipment.The internal fan rotates at a high speed, and cause injury.
Do not tilt the unit when removing it.The water inside the unit can spill and wet the furniture and floor.
Be sure to check that the refrigerating cycle section has cooled down sufficiently beforeconducting repair work.
Working on the unit when the refrigerating cycle section is hot can cause burns.
Use the welder in a well-ventilated place.Using the welder in an enclosed room can cause oxygen deficiency.
Warning
Be sure to use parts listed in the service parts list of the applicable model and appropriatetools to conduct repair work. Never attempt to modify the equipment.
The use of inappropriate parts or tools can cause an electrical shock, excessive heatgeneration or fire.
When relocating the equipment, make sure that the new installation site has sufficientstrength to withstand the weight of the equipment.If the installation site does not have sufficient strength and if the installation work is notconducted securely, the equipment can fall and cause injury.
Be sure to install the product correctly be using the provided standard installation frame.Incorrect use of the installation frame and improper installation can cause the equipmentto fall, resulting in injury.
For integral units only
Be sure to install the product securely in the installation frame mounted on a windowframe.If the unit is not securely mounted, it can fal l and cause injury.
For integral units only
Be sure to use an exclusive power circuit for the equipment, and follow the technicalstandards related to the electrical equipment, the internal wiring regulations and theinstruction manual for installation when conducting electrical work.Insufficient power circuit capacity and improper electrical work can cause an electricalshock on fire.
Be sure to use the specified cable to connect between the indoor and outdoor units.Make the connections securely and route the cable properly so that there is no forcepulling the cable at the connection terminals.Improper connections can cause excessive heat generation or fire.
8/18/2019 cara Servis Manual RX10KY1 Si_05c
12/457
Si-05C Introduction
xi
1.1.3 Inspection after Repair
When connecting the cable between the indoor and outdoor units, make sure that theterminal cover does not lift off or dismount because of the cable.If the cover is not mounted properly, the terminal connection section can cause anelectrical shock, excessive heat generation or fire.
Do not damage or modify the power cable.Damaged or modified power cable can cause an electrical shock or fire.
Placing heavy items on the power cable, and heating or pulling the power cable candamage the cable.
Do not mix air or gas other than the specified refrigerant (R22) in the refrigerant system.If air enters the refrigerating system, an excessively high pressure results, causingequipment damage and injury.
If the refrigerant gas leaks, be sure to locate the leak and repair it before charging therefrigerant. After charging refrigerant, make sure that there is no refrigerant leak.If the leak cannot be located and the repair work must be stopped, be sure to performpump-down and close the service valve, to prevent the refrigerant gas from leaking intothe room. The refrigerant gas itself is harmless, but it can generate toxic gases when itcontacts flames, such as fan and other heaters, stoves and ranges.
When replacing the coin battery in the remote controller, be sure to disposed of the oldbattery to prevent children from swallowing it.If a child swallows the coin battery, see a doctor immediately.
Warning
Caution
Installation of a leakage breaker is necessary in some cases depending on the conditionsof the installation site, to prevent electrical shocks.
Do not install the equipment in a place where there is a possibility of combustible gasleaks.If a combustible gas leaks and remains around the unit, it can cause a fire.
Be sure to install the packing and seal on the installation frame properly.If the packing and seal are not installed properly, water can enter the room and wet thefurniture and floor.
For integral units only
Warning
Check to make sure that the power cable plug is not dirty or loose, then insert the pluginto a power outlet all the way.If the plug has dust or loose connection, it can cause an electrical shock or fire.
If the power cable and lead wires have scratches or deteriorated, be sure to replacethem.Damaged cable and wires can cause an electrical shock, excessive heat generation orfire.
Do not use a joined power cable or extension cable, or share the same power outlet withother electrical appliances, since it can cause an electrical shock, excessive heatgeneration or fire.
CautionCheck to see if the parts and wires are mounted and connected properly, and if theconnections at the soldered or crimped terminals are secure.Improper installation and connections can cause excessive heat generation, fire or anelectrical shock.
8/18/2019 cara Servis Manual RX10KY1 Si_05c
13/457
Introduction Si-05C
xii
1.1.4 Using Icons
Icons are used to attract the attention of the reader to specific information. The meaning of each icon is
described in the table below:
1.1.5 Using Icons List
If the installation platform or frame has corroded, replace it.Corroded installation platform or frame can cause the unit to fall, resulting in injury.
Check the grounding, and repair it if the equipment is not properly grounded.Improper grounding can cause an electrical shock.
Be sure to measure the unsulation resistance after the repair, and make sure that theresistance is 1 Mohm or higher.Faulty insulation can cause an electrical shock.
Be sure to check the drainage of the indoor unit after the repair.Faulty drainage can cause the water to enter the room and wet the furniture and floor.
Caution
Icon Type ofInformation
Description
Note:
Note A “note” provides information that is not indispensable, but maynevertheless be valuable to the reader, such as tips and tricks.
Caution
Caution A “caution” is used when there is danger that the reader, throughincorrect manipulation, may damage equipment, loose data, get anunexpected result or has to restart (part of) a procedure.
Warning
Warning A “warning” is used when there is danger of personal injury.
Reference A “reference” guides the reader to other places in this binder or in this
manual, where he/she will find additional information on a specific topic.
8/18/2019 cara Servis Manual RX10KY1 Si_05c
14/457
Si-05C Introduction
xiii
1.2 PREFACE
The VRV System Inverter K Series is designed for easy installation and maintenance. Although it has all
the features of the previous VRV System Inverter Series, the method of displaying the model name has
been changed in order to conform to revision in Japanese Industrial Standards, the method of transmission
between outdoor and indoor units has been changed, the equipment has been modified so the same wiring
is used for transmission between indoor/outdoor units and centralized control, and can now be connected
with a central remote controller.
This maintenance manual was published in order to help you get a solid understanding of these functions,
and so you can provide fast and rel iable after sales service. Although the contents of the manual may be
insufficient in some areas, we hope that you will use it to the best of your abil ity.
The service manual for the VRV PLUS Series (cool/heat selection system) explains the new methods
(super piping and super wiring) featured by the system in four sections: Outline, Functions, Test Operation
and Troubleshooting.
Compared with previous VRV Inverter System equipment,the VRV PLUS series is designed to facilitate
construction and save space, and is equipped with a unique service mode. The manual is intended for use
when troubleshooting or executing test operation.
If you find the manual to be insufficient in any of its explanations, please let us know so we can improve on
later editions.
Oct. 1999
After Sales Service Division
8/18/2019 cara Servis Manual RX10KY1 Si_05c
15/457
Introduction Si-05C
xiv
8/18/2019 cara Servis Manual RX10KY1 Si_05c
16/457
Si-05C
General Information Inverter K Series 1
3DUW43DUW43DUW43DUW4*HQHUDO ,QIRUPDWLRQ*HQHUDO ,QIRUPDWLRQ*HQHUDO ,QIRUPDWLRQ*HQHUDO ,QIRUPDWLRQ
,QYHUWHU . 6HULHV,QYHUWHU . 6HULHV,QYHUWHU . 6HULHV,QYHUWHU . 6HULHV1. Series Introduction ..................................................................................2
1.1 NOMENCLATURE ...................................................................................2
1.2 Indoor/Outdoor Unit Combinations...........................................................4
2. Outline of System....................................................................................52.1 Easily Recognizable Features of the “K” Series.......................................5
2.2 Changes in K Series Functions / Parts.....................................................6
2.3 Compatibility of Old and New VRV System Inverter ................................9
8/18/2019 cara Servis Manual RX10KY1 Si_05c
17/457
Series Introduction Si-05C
2 General Information Inverter K Series
1. Series Introduction
1.1 NOMENCLATURE
1.1.1 Indoor Unit
8/18/2019 cara Servis Manual RX10KY1 Si_05c
18/457
Si-05C Series Introduction
General Information Inverter K Series 3
1.1.2 Outdoor Unit
RS X Y K Y1 E10
VRV System Inverter Series outdoor unit
RS : VRV System Inverter Series
Series classifications
X : Inverter
Function classification (1)
Y : Unit for heat pump
Doesn't include straight cooling VRV System Inverter Series
Capacity Indication 5 : 5 HP8 : 8 HP
10 : 10 HPModel change symbol
Indicates minor design category A,B,C...H : For other market J,K,L... Z : For EC market
Power supply classification Y1 : 3 380 ~ 415V, 50Hz YAL : 3 380V, 60Hz TAL : 3 220V, 60Hz
Special classification
E : Anti-corrosion specs.(VE002)
8/18/2019 cara Servis Manual RX10KY1 Si_05c
19/457
8/18/2019 cara Servis Manual RX10KY1 Si_05c
20/457
Si-05C Outline of System
General Information Inverter K Series 5
2. Outline of System
2.1 Easily Recognizable Features of the “K” Series
2.1.1 VRV System Inverter K Series System Outline
8/18/2019 cara Servis Manual RX10KY1 Si_05c
21/457
Outline of System Si-05C
6 General Information Inverter K Series
2.2 Changes in K Series Functions / Parts
2.2.1 Changes in the System as a Whole
More outdoor units
can be connected.
A maximum of 16 indoor units can now be connected to a single system.
5HP .......... 8 units
8HP .......... 13 units
10HP ........ 16 units
Same wiring can be
used for
transmission
between indoor/
outdoor units and
centralized control
Up to now, separate wiring was required for centralized control and for transmission between indoor/
outdoor units when installing optional controllers for centralized control, but now the same wiring can be
used for both. This facilitates indoor/outdoor transmission wiring construction work as follows.
H Series
‹ Separate input and output terminals.
‹ Has polarity.
‹ Only serial wiring can be used.
‹ Wiring can be up to 1,000 meters long.
↓
K Series
‹ Same terminals used for input and output.
‹ No polarity.
‹ 3 wiring methods can be used (serial, bus and star wiring).
‹ Up to 16 branches can be used. (Cannot be branched again once branched.)
‹ System wiring can be up to a total of 2,000 meters.
(Max. wiring length up to 1,000 meters).
„ Indoor unit terminal block
↓
„ Outdoor unit terminal block
↓
2 central remote
controller can be
connected in a
transmission
system.
VRV System Inverter K Series equipment can be connected with two central remote controllers, and can
individual control 128 unit (64 units T 2) on a single transmission line.
HSeries
Input Output Remote controller Centralized Forced off
1 2 1 2 P1 P2 F1 F2 T1 T2
KSeries
Remote controller Transmissionwiring
External
N P F1 F2 T1 T2
HSeries
C / H selector Output Out / D unit input Out / D unitoutput
Sequential startKRP 80 - 51
A B C 1 2 3 4 3 4 5 6
KSeries
C / H selector To In / D unit To Out / D unit
A B C F1 F2 F1 F2
8/18/2019 cara Servis Manual RX10KY1 Si_05c
22/457
Si-05C Outline of System
General Information Inverter K Series 7
Change in Mode of
Transmission
Between Outdoor
Units
Wiring for transmission between outdoor units is necessary for selecting cool or heat mode for several units
at once. This transmission has been changed as follows.
H Series
‹ Separate input and output terminals.
‹ Sequential start requires adaptor PC board.
‹ Simultaneous cool/heat selection and low noise operation require only wiring between outdoor units
and setting.
↓
K Series
‹ Same terminals used for input and output.
‹ Sequential start requires only wiring between outdoor units and setting.
‹ Simultaneous cool/heat selection and low noise operation require a separate adaptor for outside control
of outdoor units.
‹ Transmission can be conducted between a maximum of 10 units.
‹ Optional controllers for centralized control can be connected to a transmission line between outdoor
units.
VRV System
Inverter K SeriesOutdoor unit
F1 F2 F1 F2
Indoor-outdoor
Outdoor-outdoor
Indoor-outdoor
Outdoor-outdoor
Indoor-outdoor
Outdoor-outdoor
To other outdoor unit
To indoor unit
Indoor unit
Individual remote controller
Central remote controller
F1 F2
F1 F2N P
F1 F2
F1 F2N P F1 F2N P F1 F2N P F1 F2N P
F1 F2N P F1 F2N P
F1 F2 F1 F2F1 F2 F1 F2
(VL002)
8/18/2019 cara Servis Manual RX10KY1 Si_05c
23/457
Outline of System Si-05C
8 General Information Inverter K Series
2.2.2 Changes in Indoor Units
Drain Pump When the TEST OPERATION button has been pushed in order to facilitate checking drainage when
installing, the drain pump is force-operated regardless of the temperature control mode. If a humidifier is to
be included in the setup, you must set to gusing humidifierh with the remote controller. (With the factory
settings, the drain pump is not operated during heating.)
Swing Louver The wall mounted type is equipped with a swing louver . The ceiling mounted cassette type can be set to
prevent the ceiling from being soiled.
Able to Use
Wireless Remote
Controllers
The multi flow, double flow, ceiling suspended and wall mounted types can be fitted with a wireless remote
controller kit.
(Other types can use a separate wireless remote controller.)
2.2.3 Changes in Outdoor Units
Equipped with OilTemperature
Sensor Thermistor
(8 and 10HP)
Oil temperature detection has been incorporated into control in order to prevent wet operation and improvedilution of oil.
8/18/2019 cara Servis Manual RX10KY1 Si_05c
24/457
Si-05C Outline of System
General Information Inverter K Series 9
2.3 Compatibility of Old and New VRV System Inverter
2.3.1 H Series Indoor Units:
Cannot be connected to new outdoor unit
Connectable
Combinations
Notes 1. Old and new indoor units cannot be used together.
2.3.2 The new K Series indoor unit can be connected as an extension to an existing outdoor unit
using an optional accessory “Mix Matching Adaptor “K” Indoor Unit”
Connectable
Combinations
Notes 1. Old and new indoor units can be used together.
2. An Mix Matching Adapter for “K” Indoor Unit (DTA106A61/62) is required for one refrigerant system.
{ Can be connected
× Cannot be connected
Outdoor unit
∗VRV System Inverter K Series
RSX
RSXY
Old indoor unit (H Series) New indoor unit (K Series)
(VL003)
DTA106A61
Double flow, built-in, wall mounted, concealedfloor standing type
DTA106A62
Multi flow, ceiling suspended
Old outdoor unit
All Series (G and H Series)
Note 2
Old indoor unit (H Series) New indoor unit (K Series)
"Mix Matching Adaptor "K" Indoor Unit"
(VL004)
8/18/2019 cara Servis Manual RX10KY1 Si_05c
25/457
Outline of System Si-05C
10 General Information Inverter K Series
8/18/2019 cara Servis Manual RX10KY1 Si_05c
26/457
Si-05C
Functions Inverter K Series 11
3DUW53DUW53DUW53DUW5)XQFWLRQV)XQFWLRQV)XQFWLRQV)XQFWLRQV
,QYHUWHU . 6HULHV,QYHUWHU . 6HULHV,QYHUWHU . 6HULHV,QYHUWHU . 6HULHV1. Functions...............................................................................................12
1.1 Outdoor Unit Refrigerant System Diagram.............................................12
1.2 Function of Thermistors and Pressure Sensors.....................................26
1.3 List of Safety Devices and Functinal Parts Setting Values.....................27
1.4 Safety for Restart ...................................................................................28
1.5 Equalized Oil Level Operation
(Equalized Oil Level between Twin Compressors).................................30
1.6 Oil Return Operation ..............................................................................31
1.7 Defrost....................................................................................................32
1.8 Heating Pump Down Residual Operation...............................................33
1.9 Step Down / Safety Control → Standby (Forced Thermostat OFF) →
Stop Due to Malfunction .........................................................................35
1.10 Control During Low Outdoor Air Temperature Cooling ..........................37
1.11 Low Noise Control..................................................................................39
1.12 Demand Control .....................................................................................40
1.13 Compressor Capacity Control ................................................................41
1.14 Te / Tc Setting........................................................................................43
1.15 Gas Depletion Alarm ..............................................................................441.16 Drain Pump Control................................................................................45
1.17 Oil Temperature Sensor (8 and 10 Hp only) ..........................................47
1.18 Louver Control for Preventing Ceiling Dirt ..............................................48
1.19 Thermostat Sensor in Remote Controller...............................................49
1.20 Freeze Prevention ..................................................................................51
8/18/2019 cara Servis Manual RX10KY1 Si_05c
27/457
Functions Si-05C
12 Functions Inverter K Series
1. Functions
1.1 Outdoor Unit Refrigerant System Diagram
RSX5K Series (∗ Products produced before July ’99 and included RSX5KY1C model produced before Dec. ’99)
Note: 1. These check valves are not fitted for RSX5KY1C model.
8/18/2019 cara Servis Manual RX10KY1 Si_05c
28/457
Si-05C Functions
Functions Inverter K Series 13
A. Compressor M1C
Scroll compressor that operates on 30~116Hz by inverter drive enables 13-step capacity control.
Capacity control is carried out for individual and linear control of indoor units.
B. Oil separator
The oil separator is a device that collects the oil discharged from the compressor.
The collected oil is constantly recycled to the compressor via capillary tube.
C. Solenoid valve (hot gas bypass) Y2S
Valve is opened by low pressure safety control when low pressure drops.
Balances high/low pressure when off in order to reduce load when the compressor starts.
D. Outdoor unit electronic expansion valve Y1E
Expansion valve is kept open.
E. Solenoid valve (injection) Y3S
Controls injection in order to prevent overheating.
F. Heat exchange pipe
Subcools so that refrigerant drift doesn’t occur between indoor units when flash gas is produced in theliquid pipe.
G. Pressure sensor (high pressure, red) SENPH
Semiconductor pressure sensor carries out heat exchange control during low outdoor cooling operation by
sensing discharge pressure.
H. Pressure sensor (low pressure, blue) SENPL
Semiconductor pressure sensor for sensing the operating status of the indoor by refrigerant pressure which
senses suction pressure.
8/18/2019 cara Servis Manual RX10KY1 Si_05c
29/457
Functions Si-05C
14 Functions Inverter K Series
RSXY5K Series (∗ Included RSXY5KY1C model)
Note: 1. These check valves are not fitted for RSXY5KY1C model.2. These check valves are not fitted for products produced after Aug. ’99 and RSXY5KY1C model
produced after Jan. 2000.
8/18/2019 cara Servis Manual RX10KY1 Si_05c
30/457
Si-05C Functions
Functions Inverter K Series 15
A. Compressor M1C
Scroll compressor that operates on 30~116Hz by inverter drive enables 13-step capacity control.
Capacity control is carried out for individual and linear control of indoor units.
B. Oil separator
The oil separator is a device that collects the oil discharged from the compressor.
The collected oil is constantly recycled to the compressor via capillary tube.
C. Solenoid valve (hot gas bypass) Y2S
Valve is opened by low pressure safety control when low pressure drops.
Balances high/low pressure when off in order to reduce load when the compressor starts.
D. Outdoor unit electronic expansion valve Y1E
Expansion valve when heating. Senses compressor suction pipe and low pressure equivalent saturated
temperature, and carries out superheat degree control.
E. Solenoid valve (injection) Y3S
Controls injection in order to prevent overheating.
F. Heat exchange pipeSubcools so that refrigerant drift doesn’t occur between indoor units when flash gas is produced in the
liquid pipe.
G. Pressure sensor (high pressure, red) SENPH
Semiconductor pressure sensor for sensing the operating status of the indoor by refrigerant pressure which
senses discharge pressure.
H. Pressure sensor (low pressure, blue) SENPL
Semiconductor pressure sensor for sensing the operating status of the indoor by refrigerant pressure which
senses suction pressure.
8/18/2019 cara Servis Manual RX10KY1 Si_05c
31/457
Functions Si-05C
16 Functions Inverter K Series
RSX5K Series (∗ Products produced after August ‘99) (∗ RSX5KY1C model produced after Jan. 2000)
DU229-622A
SENPL
SENPH
8/18/2019 cara Servis Manual RX10KY1 Si_05c
32/457
Si-05C Functions
Functions Inverter K Series 17
A. Compressor M1C
Scroll compressor that operates on 30~116Hz by inverter drive enables 13-step capacity control.
Capacity control is carried out for individual and linear control of indoor units.
B. Oil separator
The oil separator is a device that collects the oil discharged from the compressor.
The collected oil is constantly recycled to the compressor via capillary tube.
C. Solenoid valve (hot gas bypass) Y2S
Valve is opened by low pressure safety control when low pressure drops.
Balances high/low pressure when off in order to reduce load when the compressor starts.
E. Solenoid valve (injection) Y3S
Controls injection in order to prevent overheating.
F. Heat exchange pipe
Subcools so that refrigerant drift doesn’t occur between indoor units when flash gas is produced in the
liquid pipe.
G. Pressure sensor (high pressure, red) SENPHSemiconductor pressure sensor carries out heat exchange control during low outdoor cooling operation by
sensing discharge pressure.
H. Pressure sensor (low pressure, blue) SENPL
Semiconductor pressure sensor for sensing the operating status of the indoor by refrigerant pressure which
senses suction pressure.
8/18/2019 cara Servis Manual RX10KY1 Si_05c
33/457
Functions Si-05C
18 Functions Inverter K Series
RSX8K·10K Series
(∗ Products produced before July ’99 and Included RSX8K, 10KY1C models produced before Dec. ’99)
Note: 1. These check valves are not fitted for RSX8K, 10KY1C models.
8/18/2019 cara Servis Manual RX10KY1 Si_05c
34/457
Si-05C Functions
Functions Inverter K Series 19
A. Compressor M1C / M2C
Connecting a scroll compressor (inverter compressor) that operates on 30~116Hz by inverter drive and a
scroll compressor (standard compressor) that runs on a commercial power supply to the same refrigerant
system enables 21-step capacity control. Capacity control is carried out for individual and linear control of
indoor units.
(M1C: Inverter compressor, M2C: Standard compressor)
B. Solenoid valve (pressure equalizing) Y1S
Balances high/low pressure when off in order to reduce load when the compressor starts.
C. Check valve
Keeps liquid refrigerant from collecting in the standard compressor when only the inverter compressor is
running.
D. Oil separator
The oil separator is a device that collects the oil discharged from the compressor. The collected oil is
constantly recycled to the compressor via capillary tube.
E. Solenoid valve (hot gas bypass) Y2S
Valve is opened by low pressure safety control when low pressure drops.
F. Outdoor unit electronic expansion valve Y1E
Expansion valve is kept open.
G. Solenoid valve (injection) Y3S / Y4S
Controls injection in order to prevent overheating.
Y3S: Inverter compressor, Y4S: Standard compressor)
H. Heat exchange pipe
Subcools so that refrigerant drift doesn’t occur between indoor units when flash gas is produced in the
liquid pipe.
I. Pressure sensor (high pressure, red) SENPH
Semiconductor pressure sensor carries out heat exchange control during low outdoor cooling operation by
sensing discharge pressure.
J. Pressure sensor (low pressure, blue) SENPL
Semiconductor pressure sensor for sensing the operating status of the indoor by refrigerant pressure which
senses suction pressure.
8/18/2019 cara Servis Manual RX10KY1 Si_05c
35/457
8/18/2019 cara Servis Manual RX10KY1 Si_05c
36/457
Si-05C Functions
Functions Inverter K Series 21
A. Compressor M1C / M2C
Connecting a scroll compressor (inverter compressor) that operates on 30~116Hz by inverter drive and a
scroll compressor (standard compressor) that runs on a commercial power supply to the same refrigerant
system enables 21-step capacity control. Capacity control is carried out for individual and linear control of
indoor units.
(M1C: Inverter compressor, M2C: Standard compressor)
B. Solenoid valve (pressure equalizing) Y1S
Balances high/low pressure when off in order to reduce load when the compressor starts.
C. Check valve
Keeps liquid refrigerant from collecting in the standard compressor when only the inverter compressor is
running.
D. Oil separator
The oil separator is a device that collects the oil discharged from the compressor. The collected oil is
constantly recycled to the compressor via capillary tube.
E. Solenoid valve (hot gas bypass) Y2S
Valve is opened by low pressure safety control when low pressure drops.
F. Outdoor unit electronic expansion valve Y1E
Expansion valve when heating. Senses compressor suction pipe and low pressure equivalent saturated
temperature, and carries out superheat degree control.
G. Solenoid valve (injection) Y3S / Y4S
Controls injection in order to prevent overheating.
Y3S: Inverter compressor, Y4S: Standard compressor)
H. Heat exchange pipe
Subcools so that refrigerant drift doesn’t occur between indoor units when flash gas is produced in the
liquid pipe.
I. Pressure sensor (high pressure, red) SENPH
Semiconductor pressure sensor for sensing the operating status of the indoor by refrigerant pressure which
senses discharge pressure.
J. Pressure sensor (low pressure, blue) SENPL
Semiconductor pressure sensor for sensing the operating status of the indoor by refrigerant pressure which
senses suction pressure.
8/18/2019 cara Servis Manual RX10KY1 Si_05c
37/457
Functions Si-05C
22 Functions Inverter K Series
RSX8, 10K Series (∗ Products produced after August ‘99) (∗ RSX8K, 10KY1C models produced after Jan. 2000)
S E N P L
INV STD
SENPH
DU232-607A
8/18/2019 cara Servis Manual RX10KY1 Si_05c
38/457
Si-05C Functions
Functions Inverter K Series 23
A. Compressor M1C / M2C
Connecting a scroll compressor (inverter compressor) that operates on 30~116Hz by inverter drive and a
scroll compressor (standard compressor) that runs on a commercial power supply to the same refrigerant
system enables 21-step capacity control. Capacity control is carried out for individual and linear control of
indoor units.
(M1C: Inverter compressor, M2C: Standard compressor)
C. Check valve
Keeps liquid refrigerant from collecting in the standard compressor when only the inverter compressor is
running.
D. Oil separator
The oil separator is a device that collects the oil discharged from the compressor. The collected oil is
constantly recycled to the compressor via capillary tube.
E. Solenoid valve (hot gas bypass) Y2S
Valve is opened by low pressure safety control when low pressure drops. Balances high/low pressure
when off in order to reduce load when the compressor starts.
G. Solenoid valve (injection) Y3S / Y4SControls injection in order to prevent overheating.
Y3S: Inverter compressor, Y4S: Standard compressor)
I. Pressure sensor (high pressure, red) SENPH
Semiconductor pressure sensor carries out heat exchange control during low outdoor cooling operation by
sensing discharge pressure.
J. Pressure sensor (low pressure, blue) SENPL
Semiconductor pressure sensor for sensing the operating status of the indoor by refrigerant pressure which
senses suction pressure.
8/18/2019 cara Servis Manual RX10KY1 Si_05c
39/457
Functions Si-05C
24 Functions Inverter K Series
RSXY8K, 10K Series (∗ Products produced after August ‘99) (∗ RSXY8K, 10KY1C models produced after Jan. 2000)
4D014597
S E N P L
INV STD
SENPH
8/18/2019 cara Servis Manual RX10KY1 Si_05c
40/457
8/18/2019 cara Servis Manual RX10KY1 Si_05c
41/457
Functions Si-05C
26 Functions Inverter K Series
1.2 Function of Thermistors and Pressure Sensors
1.2.1 Outdoor Unit
RSXY8, 10K
8/18/2019 cara Servis Manual RX10KY1 Si_05c
42/457
Si-05C Functions
Functions Inverter K Series 27
1.3 List of Safety Devices and Functinal Parts Setting Values
1.3.1 Outdoor Unit
RSXY5~10K
Note 1. These parts are for heat pump model only.
2. ∗: For products produced after Aug. ‘99.
Item Symbol Name Type
RSX(Y)5K RSX(Y)8K RSX(Y)10K
Comp-ressor
Inverterside ModelOutput
Y1 INV JT100BAVYE 3.5 kW JT100BAVTYE 3.5 kW JT100BAVTYE 3.5 kW
STD JT100BATYE 2.2 kW JT160BATYE 3.75kW
YAL INV JT100BAVYE 3.5 kW JT100BAVTYE 3.5 kW JT100BAVTYE 3.5 kW
STD JT100BATYH 2.2 kW JT160BATYH 3.75kW
TAL INV JT100BAV 3.5 kW JT100BAVT 3.5 kW JT100BAVT 3.5 kW
STD JT100BAT 2.2 kW JT160BAT 3.75kW
Compressor safetythermostat
Discharge pipe thermistor 135°C OFF
J1HC/ J2HC
Crank case heater 33W 33W+33W
F2C Over-currentrelay
Y1 — HOE-20F-TRA110A
HOE-20F-TRA113A
YAL — HOE-20F-TRA1
10A
HOE-20F-TRA1
13A
TAL — HOE-20-TRA115A
HOE-26-TRA124A
Safetydevice
Q1MQ2M
Fan motor 190W 140W+230W
Safety thermostat Open 135°C ± 5°C 140W: Open 120 ± 5°C, 230W: 135 ± 5°C
S1P Pressure switch (for highpressure safety)
20SP-688-6OFF: 27.5+0~-1.0kg/cm²ON: 20.0+1.0~-1.0kg/cm²
—
S1HP Pressure switch (for highpressure safety)
— 20SP-688-6 OFF: 27.5+0~-1.0kg/cm2
ON: 20.0+1.0~-1.0kg/cm²
S2HP Pressure switch (for highpressure safety)
— 20SP-688-6 OFF: 27.5+0~-1.0kg/cm2
ON: 20.0+1.0~-1.0kg/cm²
Fusible plug FPG-3D 70~75°C
Sensor SENPH Pressure sensor PS8030A 0~30kg/cm² (0~2.94MPa)
SENPL Pressure sensor PS8030A 0~10kg/cm² (0~0.98MPa)
R1T Thermistor (for outdoor air) 3.5~360KΩ
R2T Thermistor(for heat exchange)
3.5~360KΩ
R3T Thermistor(for discharge pipe)
3.5~400KΩ —
R3-1T Thermistor (for inverterdischarge pipe)
— 3.5~400KΩ
R3-2T Thermistor (for standarddischarge pipe)
— 3.5~400KΩ
R4T Thermistor(for suction pipe)
3.5~360KΩ
R5T Thermistorfor inverter oil temperature)
— 3.5~400KΩ (∗ 3.5~360KΩ)
Otherfunctions
/parts
Y1ENote 1
Electronicexpansion valve
Whencooling
ON: 2,000 pulses (completely open); OFF: 0 pulses (completely closed)
Whenheating
ON: PI control; OFF: 0 pulses (completely closed)
Y2S Solenoid valve(for hot gas bypass)
NEV603
Y3S Solenoid valve(for inverter injection)
NEV202 (∗ ST10D)
Y4S Solenoid valve(for standard injection)
— NEV202 (∗ ST10D)
Y1SNote 1
Solenoid valve(pressure equalizing)
— NEV202 (∗ ST10D)
8/18/2019 cara Servis Manual RX10KY1 Si_05c
43/457
Functions Si-05C
28 Functions Inverter K Series
1.4 Safety for Restart
1.4.1 Restart Safety TimerThe compressor will not run for five minutes by making forced thermostat OFF condition in order to prevent
it from being turned on and off in rapid succession, and to equalize pressure in the refrigerant circuit. It
however restarts automatically after five minutes passes if it is in thermostat ON condition. The pressure
equalizing solenoid valve is actuated for 10 minutes (15 minutes for 8 and 10HP heating only) after the
compressor stops in order to equalize pressure.
If 10 minutes or more has elapsed since the compressor was turned off (15 minutes for 8 and 10HP heating
only) , turn the solenoid valve for equalizing pressure on for about 1 minute and equalize the pressure.
When heating, to prevent noise produced by the passing of indoor unit’s refrigerant to equalize pressure
after the compressor stops, fully close the indoor unit’s electronic expansion valve for 5 minutes (10
minutes for 8 and 10HP).
1.4.2 Soft Start
The following control is carried out to protect the compressor and inverter.
1. Operates at low frequency (fixed) for 1 minute after compressor starts. (Prevents liquid refrigerant
backflow)
2. Pressure equalizing and hot gas bypass solenoid valves open and start low load.
Soft Start ofCompressor
Thermostat
Thermostat ONThermostatOFF Thermostat OFF
Thermostat ON Thermostat ON
Compressor
ON ON ON
OFF OFF
5 minutes
Pressure equalizingsolenoid valve
1 minute(Soft start)
10 minutes(15 minutes for8.10 HP heating only)
1 minute(Pressure equalizing)
1 minute(Soft start)
Indoor unitelectronic expansionvalve (when heating)
Linear control
Fully closed0 pulses
Linear control
Fully closed0 pulses
1000 pulses
5 minutes
(10 minutesfor 8 and 10 HP)
240 pulses1000 pulses
Linear control
OFF OFF
ON ON
OFF
ON
OFF
(VL005)
C o m p r e s s o r f r e q u e n c y
1 minute when started Time
(VG001)
Frequency during soft start
5K 42Hz
8,10K 42Hz+OFF
8/18/2019 cara Servis Manual RX10KY1 Si_05c
44/457
Si-05C Functions
Functions Inverter K Series 29
1.4.3 Pump Down StartIf the compressor stops running with refr igerant still remaining in the accumulator, in order to prevent wet
operation at the next compressor starting, it will perform pump down start with a completely dry
accumulator, then it will operate normally.
Pump down start should be performed if the unit is in any of the conditions given below when pressure
equalizing control has been completed before start.
If R3T (R3-1T) is less than 95°C and the unit is in any of the following conditions.
‹ Within 10 minutes of the compressor starting
‹ Defrosting or during oil return
‹ Within 20 minutes of completion of defrost or oil return
‹ Outdoor air temperature is less than -5°C
Operation During
Pump Down Start
Note 1. Note 1: 30Hz (30Hz+OFF) for products produced after Aug. ‘99.
2. ∗Note 2 : When heating, low pressure < 1.5 kg/cm² (0.147MPa) → running frequency 54Hz (54Hz +
OFF)
Low pressure > 1.7 kg/cm² (0.167MPa) [30 sec. continuous] → release
‹ Y2S: Hot gas bypass solenoid valve
‹ Y3S: Injection solenoid valve
1.4.4 Heating Lay-Up Start
If the compressor hasn’t run for a long time and the refrigerant isn’t circulated, foaming could cause a lack
of oil when the compressor is started at the next time. It should therefore perform heating lay-up start to
keep the low pressure from dropping too low in the following cases.
‹ When, after being power ON, the accumulated running time of the compressor does not exceed one
hour.
‹ When the compressor has been stopped for more than 24 hours.
Operation During
Heating Lay-Up
Start
Make the compressor’s upper limit frequency 60Hz (60Hz+OFF) for 10 minutes 20 seconds after the
compressor starts.
∗ If the low pressure becomes < 1.5kg/cm² (0.147MPa) within 10 minutes after starting, Y2S is actuated
and outdoor unit EV becomes 0 pulses. 10 minutes after start, the unit starts up as described below.
(8,10 Hp)
‹ Y2S: Hot gas bypass solenoid valve
‹ Y3S: Injection solenoid valve
∗ If low pressure becomes < 1.5 kg/cm² (0.147MPa), operating frequency becomes 54Hz.
If low pressure becomes > 1.7 kg/cm² (0.167MPa), the heating lay-up operation is released.
←11 min. 30 sec. →
1 min. 5 min. 30 sec. 30 sec. 4 min. 30 sec.
Compressor 42Hz
(42Hz+OFF)
42Hz
(42Hz+OFF)
42Hz
(42Hz+OFF) Note 1
30~106 Hz+OFF
PI control ∗ Note 2Outdoor unit EV 0 pulses 0 pulses 0 pulses SH control (Initial
opening 150 pulses)
Outdoor unit fan H tap (H+ON) H tap (H+ON) H tap (H+ON) H tap (H+ON)
Y2S ON ON ON OFF ON/OFF(LP protection control)
Y3S, Y4S ON ON/OFF(Td protection control)
ON/OFF(Td protection control)
ON/OFF(Td protection control)
4 min. 30 sec.
Compressor PI control (upper limit 116Hz [116Hz+OFF]) ∗
Outdoor unit EV SH control (initial opening 150 pulses)
Outdoor unit fan H tap (H+ON)
Y2S ON/OFF (LP safety control)
Y3S ON/OFF (Td safety control)
8/18/2019 cara Servis Manual RX10KY1 Si_05c
45/457
Functions Si-05C
30 Functions Inverter K Series
1.5 Equalized Oil Level Operation
(Equalized Oil Level between Twin Compressors)
If using two compressors (8, 10Hp) connected in parallel, oil level equalizing is carried out for 5 minutes if
the cumulative running time of the standard compressor exceeds 2 hours in order to prevent lack of oil
cause by difference in pressure inside the dome due to drift, and then reverts to normal operation.
∗ If oil pressure equalization is not achieved during 5 minutes by stopping or step down control, oil pressure
equalization is carried out when the compressor starts running.
With an inverter compressor operation, however, i f the standard compressor remains off for 10 minutes,
the cumulative running time of the standard compressor is reset.
Inverter compressor Standard compressor
106Hz OFF
8/18/2019 cara Servis Manual RX10KY1 Si_05c
46/457
Si-05C Functions
Functions Inverter K Series 31
1.6 Oil Return Operation
In order to collect refrigeration oil held up in connecting piping, the compressor’s operating time is counted,
and oil return operation is carried out for 4 minutes every 8 hours (2 hour after turning on the power supply,
and every 8 hours after that).
(When heating, the indoor unit’s electric heater is tuned off one minute prior to oil return operation in
preparation for oil return.)
1.6.1 Compressor Operation Frequency
‹ When heating, frequency is lower than that given in the table for the first 30 seconds and 30 seconds
after completion.
‹ Frequency may drop according to the various types of step-down control. If so, the next oil return must
be carried out 4 hours later.
1.6.2 Opening of The Electronic Expansion Valve
1.6.3 4-way Changeover Valve (Y1R)
When cooling: No change
When heating: Switches to cooling mode
1.6.4 Fan and Solenoid ValveStep No. changes according to high pressure.
(Step No. becomes higher as high pressure decreases.)
Step 1 → Step 2 30 sec. after oil return start or high pressure < 16kg/cm² (1.57MPa)
Step 2 → Step 3 High pressure < 7.5 kg/cm² (0.74MPa)
Step 3 → Step 2 High pressure > 15 kg/cm² (1.47MPa)
Step 2 → Step 1 High pressure > 20 kg/cm² (1.96MPa)
∗ When heating only
∗∗ On when low pressure < 0.3 kg/cm² (0.029MPa)
Off when low pressure > 0.8 kg/cm² (0.078MPa)
Notes: 1. If the compressor frequency continues at 68Hz (38Hz+ON for 8, 10HP) or more for more than eightminutes with defrosting while the oil return timer is counting, the timer is reset and counts again for eight
hours.
2. If on standby (forced thermostat OFF) or the compressor stops due to malfunction during oil return
operation, the next time the compressor starts, oil return operation is again carried out for four minutes
after completion of soft start.
3. Oil return operation is not carried out for 28 minutes after defrost is completed.
Type Cool Heat
5K(5HP) 106Hz 96Hz
8K(8HP) 106Hz+ON 86Hz+ON
10K(10HP) 106Hz+ON 86Hz+ON
Outdoor unit Operating indoor unit Indoor unit turned offWhen cooling 2000 pulses (fully open) 2000 pulses (fully open) 1440 pulses
When heating 2000 pulses (fully open) 2000 pulses (fully open) 2000 pulses (fully open)
Step No. Y2S Y3S, Y4S Fan
1 ON∗ ON H(H+ON)
2 OFF∗∗ ON L(H+OFF)
3 OFF∗∗ ON OFF
8/18/2019 cara Servis Manual RX10KY1 Si_05c
47/457
Functions Si-05C
32 Functions Inverter K Series
1.7 Defrost
„ Function
Defrost operation is carried out if the relation of the outdoor unit’s coil temperature (Tcoil) and outdoor
temperature (Tair) satisfies the conditions given below for 5 minutes continuously.
The values of (α) according to defrost temperature changeover switch are given in the table below.
Therefore, if outdoor temperature is 0°C:
(1) If position L, Tcoil ≤ -12°C
(2) If position M, Tcoil ≤ -10°C
(3) If position H, Tcoil ≤ -8°C
Because defrost operation is carried out, set to the “H” position if frost builds up easily, and set to “L” if not.Factory set is position “M.”
Defrost is carried out when the coil temperature rises to 12.5ºC or higher, and is completed after defrosting
for 10 minutes. After defrosting, indoor units carry out hot start operation and the DEFROSTING display
lights until hot start is complete.
Defrost conditions are not counted from completion of power supply set-up and defrost until the
compressor runs (count) for 20 minutes.
Tcoil ≤ C · Tair- α
• Tcoil : Temperature detected by R2T
• Tair : Temperature detected by R1T
• C : Tair < 0°C → 0.8 Tair ≥ 0°C→ 0.6
Switch positionLED (23 24 25 26)
L(O O O {)
M(O O { O)
H(O { O O)
(deg) 12 10 8
Power supply set-up
T coil
12.5ºC
06.Tair · U
20 minutes 5 minutes
Defrost start Complete
20 minutes 5 minutes 10 minutes
Defrost start Complete
(VG002)
8/18/2019 cara Servis Manual RX10KY1 Si_05c
48/457
Si-05C Functions
Functions Inverter K Series 33
1.8 Heating Pump Down Residual Operation
1.8.1 For RSXY 8, 10 KIf refrigerant is remaining in the accumulator when the compressor starts, liquid refr igerant is sucked into
the compressor, diluting the refrigerant machine oil and reducing the lubricating performance. To prevent
this, the pump-down operation discharges refrigerant from the low pressure side when the unit is not in
operation.
Residual operation may be carried out for 10 minutes under the following conditions when heating.
1. When outdoor temperature (R1T) is ≥ -5°C and inverter discharge pipe temperature (R3-1T) < 95ºC,
and a OFF by thermostat command is received with the compressor’s continuous operation time being
10 minutes or less, residual operation is carried out for a maximum of 10 minutes.
< For products produced in and after August 1999 >
2. When the thermostat is ON during residual operation, residual operation is not carried out if the total of
1+2+3 is 10 minutes or more.
3. When outdoor temperature (R1T) < -5°C and a stop command is received from the thermostat sensor,
etc., residual operation is carried out for 10 minutes without fail. (Operation may however stop for
discharge pipe or high/low pressure safety. )
&
Discharge pipe thermistor (R3-1T) on inverter side: 95°C or lower
OR
Outside air temperature thermistor (R1T) < 0°C
When compressor continuous operating time is less than 10 minutes and thermostat is OFF, orwhen stop command is received from remote controller
Within 20 minutes after defrost or oil return operation
T0 (oil temperature)≤ Te+10
Thermostat
Compressor and outdoor unit fan
Max. 10 min.
ON
OFF
ON
OFF
Residual operation for 10 min.
Operation may stop during the 10 minutesresidual operation due to protection discharge,high/low pressure, etc.
(VL006)
Thermostat
Max. 10 min. Max. 10 min.
Compressor andoutdoor unit fan
Residualoperation
Residual operation not carried outif 1 + 2 + 3 is 10 minutes or more.
ON
OFF
ON
OFF
(VL007)Thermostat
ON
1 2 3
8/18/2019 cara Servis Manual RX10KY1 Si_05c
49/457
8/18/2019 cara Servis Manual RX10KY1 Si_05c
50/457
Si-05C Functions
Functions Inverter K Series 35
1.9 Step Down / Safety Control → Standby (Forced Thermostat OFF) → Stop Due
to Malfunction
High Pressure (Hp) Control
Low Pressure (Lp) Control
Discharge Pipe Temperature (Td) Control
Hp≥23.5kg/cm²(2.303MPa)
Hp≥21.0kg/cm²(2.058MPa)
Hp≥24.0kg/cm²(2.352MPa)
Hp>25.0kg/cm²(2.450MPa)
Hp>27.5kg/cm²(2.695MPa)
(Cooling)
Frequency1 STEP DOWN
(Heating)
30Hz+OFF(30Hz)
8, 10HP(5HP)76Hz+OFF(48Hz)
Forced OFFby thermostat
E3 stop dueto malfunction
(VF001)
Lp>2.0kg/cm²(0.196MPa)
R5T≤Te+10˚C&
Lp15˚C&
Lp90˚C&Lp90˚C&Lp90˚C&During high pressure control&Lp135˚C
Forced thermostat OFFUp to 2 times
in 100 minutes
Td≥135˚C
F3 stop dueto malfunction
(VF005)
Control
duringheating( )
8/18/2019 cara Servis Manual RX10KY1 Si_05c
51/457
Functions Si-05C
36 Functions Inverter K Series
Inverter Current Control
Discharge Super
Heating (DSH)
Control
(DSH = Td - high pressure condensation saturation temperature)
During both the inverter and standard compressors are running, when the injection valve for either one
goes OFF and discharge super heating (DSH) continues for 10 minutes at temperature difference of less
than 10°C, the inverter+standard compressor are controlled at 76 Hz or less+OFF for 3 minutes.
Control According
to Outdoor
Temperature
If the outdoor temperature exceeds 27°C when heating, forced thermostat OFF is carried out in order to
prevent a safety device from being tripped or a sensor malfunction.
INV≥27.0A(TAL)15.0A(Y1, YAL)
FREQUENCY
1 STEP DOWN
L8 stop dueto malfunction
27.0 / 15.0
INV≥27.5A(TAL)15.0A(Y1, YAL)
Forced OFF by thermostat
UP to 4 times in 60 minutes
27.5 / 15.0
(VF004)
8/18/2019 cara Servis Manual RX10KY1 Si_05c
52/457
Si-05C Functions
Functions Inverter K Series 37
1.10 Control During Low Outdoor Air Temperature Cooling
When the outdoor air temperature is low in cooling operation, outdoor unit fans, electronic expansion valve
and compressors are controlled as follows in order to primarily maintain high pressure and to protect drop
in refrigerant circulation caused by drop in high pressure.
RSXY5K
RSXY8,10K
NOTE: Step No. changes according to high pressure, low pressure and frequency.
(Step No. increases with reduction of high and low pressure.)
Low Outdoor Air Cooling IN Conditions (Steps 1-1, 2, 3)
Operating status Electronic expansion valve Fan Frequency (Hz)
Normal operation Fully open H Changes according to operatingstatus
Low outdoor temperaturecooling operation
Step 1 Fully open L 76
Step 2 Fully open OFF 48
Operating status Electronic expansion valve Fan Frequency (Hz)
M1F M2F 8K 10K
Normal operation Fully open H ON Changes according to operatingstatus
Low outdoor temperaturecooling operation
Step 1-1 Fully open L ON 96 116
Step 1-2 Fully open H OFF 86 106
Step 1-3 Fully open L OFF 76 96
Step 2 Fully open OFF OFF 60 76
Normal operation
Step 1-1
Step 1-2
carried out 30continuousseconds
carried out 30continuousseconds
carried out 30
continuousseconds
Step 1-3
carried out 30
continuousseconds
• Cooling with compressor running(doesn't include oil return)
&• High pressure < 10 kg/cm²
• EV = 2000 pulses(completely open)
or• High pressure > 14 kg/cm²
(1.372 MPa)• EV = 2000 pulses(completely open)
or• High pressure < 14 kg/cm²
(1.372 MPa)or
• Low outdoor air cooling INconditions (Step 2)
Conditions satisfied
(VF006)
8/18/2019 cara Servis Manual RX10KY1 Si_05c
53/457
Functions Si-05C
38 Functions Inverter K Series
Low Outdoor Air
Cooling IN
Conditions (Step 2)
Normal operation
Step 2
• Cooling with compressor running(doesn't include oil return)
&• High pressure < 7.5 kg/cm²
(0.735 MPa)&
• Outdoor air temperature < 20˚C&
• Radiator fin temperature < 60˚C
• Compressor offor
• Other than cooling (includes oil return)or
• High pressure > 15.8 kg/cm²
(1.548 MPa)or
• Outdoor air temperature > 25˚Cor
• Radiator fin temperature > 80˚C
Condition satisfied
Conditions satisfied
(VF007-1)
Normal operation
Step 2
• Cooling with compressor running(doesn't include oil return)
&• High pressure < 7.5 kg/cm²
(0.735 MPa)&
• Radiator fin temperature < 60˚C
• Compressor off
or• Other than cooling (includes oil return)
or• High pressure > 15.8 kg/cm²
(1.548 MPa)or
• Radiator fin temperature > 80˚C
Condition satisfied
Conditions satisfied
(VF007-2)
8/18/2019 cara Servis Manual RX10KY1 Si_05c
54/457
Si-05C Functions
Functions Inverter K Series 39
1.11 Low Noise Control
If sound produced by outdoor units is a problem at night, etc., you can reduce the running noise by 2 to 3
dB by running the outdoor unit fans and compressors at low speed via contact input (low noise input) from
outside. When low noise input is received (contact short circuit) while the compressor is running (except
when defrosting or oil return is being carried out), the operation upper limit is as follows.
‹ When cooling: Step1 → 2 high pressure > 24 kg/cm² (2.35 MPa)
Step2 → 1 high pressure < 19 kg/cm² (1.86 MPa)
„ Low noise control reduces capacity by limiting the fan and compressor. The load when heating is
particularly large at night when the outdoor temperature is low, and could result in insufficient capacity.
„ During low noise control, retry is unlimited for standby (forced thermostat OFF) produced by high
pressure, low pressure or discharge pipe temperature.
„ An optional external control adaptor of outdoor units is required for low noise control. For method of
connection, see low noise operation in the test operation section.
5K 8K 10K
(5HP) (8HP) (10HP)
Outdoor unit fan step 1 L tap H tap+OFF
step 2 L tap L tap+OFF
compressor 60Hz 86Hz+OFF 96Hz+OFF
8/18/2019 cara Servis Manual RX10KY1 Si_05c
55/457
8/18/2019 cara Servis Manual RX10KY1 Si_05c
56/457
Si-05C Functions
Functions Inverter K Series 41
1.13 Compressor Capacity Control
RSXY5K Pressure is sampled every 20 seconds by pressure sensor, and the inverter compressor is controlled in 13
stages by microcomputer.
Frequency range: 34 - 116 Hz (13 stages) and common for 50/60Hz area.
RSXY8, 10K
Pressure is sampled every 20 seconds by two pressure sensors, and the inverter compressor is controlled
in 21 stages by microcomputer. (∗ 20 Stages for products produced after Aug. ‘99)
Frequency
30Hz
34Hz
38Hz
42Hz
48Hz
54Hz
60Hz
68Hz
76Hz
86Hz
96Hz
106Hz
116Hz
Min. output
Max. output
(VE004)
Commercial power supply
compressor (off)
Frequency
30Hz+OFF
34Hz+OFF
38Hz+OFF
42Hz+OFF
48Hz+OFF
54Hz+OFF
60Hz+OFF
68Hz+OFF
76Hz+OFF
86Hz+OFF
96Hz+OFF
106Hz+OFF
116Hz+OFF
Commercial power supply
compressor (full load)
Frequency
38Hz+ON
48Hz+ON
60Hz+ON
76Hz+ON
86Hz+ON
96Hz+ON
106Hz+ON
116Hz+ON
Min. output
Max. output
(VE005)
8/18/2019 cara Servis Manual RX10KY1 Si_05c
57/457
Functions Si-05C
42 Functions Inverter K Series
Commercial power supply
compressor (off)
Frequency
30Hz+OFF
34Hz+OFF
38Hz+OFF42Hz+OFF
48Hz+OFF
54Hz+OFF
60Hz+OFF
68Hz+OFF
76Hz+OFF
86Hz+OFF
96Hz+OFF
106Hz+OFF
Commercial power supply
compressor (full load)
Frequency
38Hz+ON
48Hz+ON
60Hz+ON
76Hz+ON
86Hz+ON
96Hz+ON
106Hz+ON
116Hz+ON
Min. output
Max. output
(VE006)
8/18/2019 cara Servis Manual RX10KY1 Si_05c
58/457
Si-05C Functions
Functions Inverter K Series 43
1.14 Te / Tc Setting
You can alter the value of targets Te (evaporating pressure equivalent temperature) and Tc (condensing
pressure equivalent temperature) with setting mode 2. PI control is used to control compressor capacity so
that Te when cooling and Tc when heating are constant.
‹ Target Te changes according to compressor operating frequency, length of piping and indoor load. The
range is -10°C ≤ target Te ≤ 5.5°C. (Piping length is determined automatically during oil return
operation.)
∗ Target Tc becomes 3°C higher when indoor load is large. Target Tc is controlled in accordance with the
following conditions:
‹ Outdoor temp. > 10°C → target Tc ≤ 46°C
‹ Outdoor temp. ≤ 10°C → target Tc ≤ 49°C
‹ Target Tc
= 43°C when high pressure > 17 kg/cm² (1.67 MPa) and low pressure < 1.8 kg/cm² (0.176 MPa).
Te setting Set temperature
High 8.5 °C
Standard 5.5 °C
Low 2.5 °C
Tc setting Set temperature
High 49 °C
Standard 46 °C
Low 43 °C
8/18/2019 cara Servis Manual RX10KY1 Si_05c
59/457
Functions Si-05C
44 Functions Inverter K Series
1.15 Gas Depletion Alarm
An alarm (U0) is given for severe gas depletion. Alarm is indicated but operation continues.
When cooling
When heating
While compressor is runningand
Low pressure < 1.0 kg/cm²
Gas depletion alarm cancellation
Gas depletion alarm (U0) is displayed.
Compressor offor
Low pressure Lp ≥ 1.0 kg/cm²
Conditions given on theleft continue for 30 min.
(VF008)
While compressor is runningand
4-way valve ON (heating cycle)and
Evaporator outlet superheattemperature > 20˚C difference
andOutdoor unit electronic expansion
valve = 2000 pulses (completely open)
Gas depletion alarm cancellation
Gas depletion alarm (U0) is displayed.Conditions given on theleft continue for 60 min.
Compressor offor
4-way valve OFF (cooling cycle / defrost)or
Evaporator outlet superheattemperature ≤ 20˚C difference
orOutdoor unit electronic expansionvalve < 2000 pulses (Fully open)
(VF009)
8/18/2019 cara Servis Manual RX10KY1 Si_05c
60/457
8/18/2019 cara Servis Manual RX10KY1 Si_05c
61/457
Functions Si-05C
46 Functions Inverter K Series
1.16.3 When the Float Switch is Tripped During Heating Operation:
During heating operation, if the float switch is not reset even after the 5 minutes operation, 5 seconds stop,
5 minutes operation cycle ends, operation continues until the switch is reset.
1.16.4 When the Float Switch is Tripped and “AF” is Displayed on the Remote Controller:
Note: If the float switch is tripped five times in succession, a drain malfunction is determined to have occurred.
“AF” is then displayed as operation continues.
8/18/2019 cara Servis Manual
Top Related